INHIBITOR PROTECTION OF HOT-DIP ZINC STEELIN CHLORIDE-CONTAINING ENVIRONMENT

Abstract

Hot-dip zinc steel is widely used in mechanical engineering, chemical and mining industries, municipal and agricultural
sectors due to its low cost and reliability of the method of corrosion protection of carbon and low-alloy steel.
The inhibitory protection of hot-dip zinc products — when they are used in closed working environments and during
etching and acid cleaning of the equipment — is topical. The behaviour of thiourea and sodium molybdate in 3% NaCl
solution as corrosion inhibitors that do not contain chromium in their composition is studied. It has been shown experimentally
that thiourea works as a corrosion inhibitor in the entire range of concentrations 0.0006…0.003 M,
providing a protective effect of 36…64%. The introduction of sodium molybdate from 0.0006 M to 0.0015 M into 3%
NaCl solution results in a slight increase in the corrosion rate of zinc. When the concentration of sodium molybdate is
raised to 0.003 M, it exhibits inhibitory properties, reducing the zinc weight corrosion factor to 0.078 g / (m2·h).

Fig. 3. Tab. 1. Ref.: 7 titles.